TY - JOUR

T1 - Quantum magnetotransport in a nondegenerate two-dimensional electron gas under extremely strong magnetic fields

AU - Peters, P.J.M.

AU - Scheuzger, P.

AU - Lea, M.J.

AU - Monarkha, Yu P.

AU - Sommerfeld, P.K.H.

AU - van der Heijden, R.W.

PY - 1994

Y1 - 1994

N2 - The quantum magnetotransport properties of a nondegenerate two-dimensional gas of electrons interacting with helium-vapor atoms above a liquid-helium surface is studied in magnetic fields up to 20 T by the ac capacitive coupling technique. The data and the theoretical analysis performed show that in the ultraquantum limit the generalized or effective collision frequency νeff of the electrons increases faster with magnetic field than the cyclotron frequency ωc. Under extremely strong magnetic fields, where the Landau level width becomes comparable to or larger than the thermal energy, the high-cyclotron-frequency approximation ωcνeff, usually assumed in quantum transport theories, is no longer valid. The self-consistent Born-approximation theory is extended to be valid for any ratio of ωc to νeff. Then it describes the data perfectly without any adjustable parameter. The results reported here also give strong support to the universality of the linear Hall resistivity.

AB - The quantum magnetotransport properties of a nondegenerate two-dimensional gas of electrons interacting with helium-vapor atoms above a liquid-helium surface is studied in magnetic fields up to 20 T by the ac capacitive coupling technique. The data and the theoretical analysis performed show that in the ultraquantum limit the generalized or effective collision frequency νeff of the electrons increases faster with magnetic field than the cyclotron frequency ωc. Under extremely strong magnetic fields, where the Landau level width becomes comparable to or larger than the thermal energy, the high-cyclotron-frequency approximation ωcνeff, usually assumed in quantum transport theories, is no longer valid. The self-consistent Born-approximation theory is extended to be valid for any ratio of ωc to νeff. Then it describes the data perfectly without any adjustable parameter. The results reported here also give strong support to the universality of the linear Hall resistivity.

UR - http://www.scopus.com/inward/record.url?scp=0001573668&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.50.11570

DO - 10.1103/PhysRevB.50.11570

M3 - Article

AN - SCOPUS:0001573668

VL - 50

SP - 11570

EP - 11576

JO - Physical Review B: Condensed Matter

JF - Physical Review B: Condensed Matter

SN - 0163-1829

IS - 16

ER -